title: Label-free route to rapid, nanoscale characterization of cellular structure and dynamics through opaque media.
abstract: We report a novel technique for label-free, rapid visualization of structure and dynamics of live cells with nanoscale sensitivity through traditionally opaque media. Specifically, by combining principles of near-infrared (NIR) spectroscopy and quantitative phase imaging, functional characterization of cellular structure and dynamics through silicon substrates is realized in our study. We demonstrate the efficacy of the new approach by full-field imaging of erythrocyte morphology in their native states with a nm path length sensitivity. Additionally, we observe dynamic variations of human embryonic kidney cells, through a silicon substrate, in response to hypotonic stimulation with ms temporal resolution that also provides unique insight into the underlying biophysical changes. The proposed technology is fundamentally suited for high-performance investigations of biological specimens and significantly expands the options for visualization in complex microfluidic devices fabricated on silicon.
authors.affiliation: 1] Biophysics and Physiology Lab, Department of Physics, The University of Texas at Arlington, Texas 76019, USA [2].
authors.forename: Bipin
authors.initials: B
authors.lastname: Joshi
authors.forename: Ishan
authors.initials: I
authors.lastname: Barman
authors.forename: Narahara Chari
authors.initials: NC
authors.lastname: Dingari
authors.forename: Nelson
authors.initials: N
authors.lastname: Cardenas
authors.forename: Jaqueline S
authors.initials: JS
authors.lastname: Soares
authors.forename: Ramachandra R
authors.initials: RR
authors.lastname: Dasari
authors.forename: Samarendra
authors.initials: S
authors.lastname: Mohanty
mesh_terms: D002460:Cell Line; D022082:Cellular Structures / Q000737:chemistry*; D004912:Erythrocytes / Q000166:cytology / Q000648:ultrastructure; D006801:Humans; D057054:Molecular Imaging / Q000379:methods*; D012825:Silicon / Q000737:chemistry; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation / Q000379:methods*; D013194:Staining and Labeling
chemical_list: D012825:Silicon